Athin film soap bubble (n=1.35) is floating in air. if the thickness of the bubble wall is 300nm, which of the following wavelengths of visible light is strongly reflected?

540 nm

Explanation:

According to the question,

The refractive index of the soap bubble, .

The thickness of the soap bubble wall is, .

Now, for constructive interference of soap bubble.

.

Now for first order m=1.

Therfore,

Substitute all the variables in the above equation.

.

Therefore,

.

Therefore the visible light wavelength which is strongly reflected is 540 nm.

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia